org.obm.push.data.formatter.HTMLBodyFormatter.java Source code

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: GPL 2.0
 *
 * The contents of this file are subject to the GNU General Public
 * License Version 2 or later (the "GPL").
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Initial Developer of the Original Code is
 *   MiniG.org project members
 *
 * ***** END LICENSE BLOCK ***** */

package org.obm.push.data.formatter;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringEscapeUtils;

/**
 * Convert text/plain mail body to HTML. The HTML version should be used for
 * display & rich formatting.
 * 
 * @author tom
 * 
 */
public class HTMLBodyFormatter {

    private static String PATTERN_EMAIL = "[a-zA-Z_0-9\\-.]+@[a-zA-Z_0-9\\-.]+\\.[a-z]+";

    private static String PATTERN_URL = "(((http://)|(https://)|(w{3}.))"
            + "+[a-zA-Z_0-9\\-]+(\\.\\w[a-zA-Z_0-9\\-]+)" + "+(/[#&;\\n\\-=?:|,()@\\+\\%/\\.\\w]+)?+(:[0-9]*+)?)";

    public HTMLBodyFormatter() {
    }

    public String convert(String plain) {
        StringBuilder sb = new StringBuilder();
        sb.append("<html><body>");
        String escaped = StringEscapeUtils.escapeHtml(plain);
        escaped = escaped.replaceAll("\r\n", "<br>");
        sb.append(escaped);
        sb.append("</body></html>");

        Pattern p = Pattern.compile(PATTERN_URL + "|" + PATTERN_EMAIL);
        Matcher m = p.matcher(sb);
        StringBuffer res = parseUrl(m, sb);
        if (res.toString().length() > 0) {
            return res.toString();
        } else {
            return sb.toString();
        }

    }

    public StringBuffer parseUrl(Matcher m, StringBuilder input) {
        StringBuffer result = new StringBuffer();

        Pattern pEmail = Pattern.compile(PATTERN_EMAIL);
        Pattern pUrl = Pattern.compile(PATTERN_URL);

        while (m.find()) {
            String href = m.group();
            Matcher mEmail = pEmail.matcher(href);
            Matcher mUrl = pUrl.matcher(href);

            if (mUrl.find()) {
                if (href.startsWith("http")) {
                    m.appendReplacement(result, "<a href=\"" + href + "\" target=\"_blank\">" + href + "</a>");
                } else {
                    m.appendReplacement(result,
                            "<a href=\"http://" + href + "\" target=\"_blank\">" + href + "</a>");
                }
            } else if (mEmail.find()) {
                m.appendReplacement(result, "<a href=mailto:" + href + ">" + href + "</a>");
            }
        }
        m.appendTail(result);
        return result;
    }

}